有理数简便运算.27乘(-3/2)-15乘2/3-9乘2/3

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有理数简便运算.27乘(-3/2)-15乘2/3-9乘2/3
有理数简便运算.27乘(-3/2)-15乘2/3-9乘2/3

有理数简便运算.27乘(-3/2)-15乘2/3-9乘2/3
27乘(-3/2)
=-81/2
-15乘2/3
=-10
-9乘2/3
=-6

27乘(-3/2)-15乘2/3-9乘2/3
=-81/2-30/3-18/3
=-81/2-10-6
=-81/2-16
=-113/2

27乘(-3/2)-15乘2/3-9乘2/3
=-40.5-(15+9)乘2/3
=-40.5-24乘2/3
=-40.5-16
=-56.5